bit convoluted but I've recently been through a pretty similar experience;
I've got both powerline as well as .ac in both my laptop and now main PC (as well as various phones / tablets)
They are both highly variable depending on where in the house I am
My house is extended both on the side over the old garage and to the rear so big chunks of my house are on the other side of an old external wall.
The Virgin line comes in to the house via the dining room at the front of the property and I got them to put in a long line so that the Virgin AC router sits against one wall but roughly in the middle of the old part of the property.
In the new living room I get the full 150mbps via 500mbps powerlines, but wireless from the main unit I only get 60mbps, so I now have a wireless N router in the living room which serves that room and also improves the reception we get in our main bedroom.
My office and our son's bedroom is directly above the .ac router - I had my main PC on a powerline and was getting 60mbps so when we got upgraded (and paid the £50 for the new Virgin .ac router), I found a high gain .ac USB adapter to give that a go, and I get better ping and the full 150mbps now in my office, I had a wirelessN USB adapter and that would only attach to the router at 150mbps and also got about 50-60mbps on speedtest, so getting the .ac USB was a massive improvement
so... both will vary massively depending on where in the house you are, .ac works fine through internal walls and floors but struggles through external type walls, if you do get powerlines you may find that they work well on say the ground floor if they are all on the same loop, but from downstairs to upstairs where its on a seperate loop it struggles in my house (brand new consumer unit), so I've ended up using powerlines downstairs with 2 wireless routers/repeaters to serve upstairs
In all cases, I get better transfer rates over 5ghz than over 2.4ghz, even when the signal strength shows up as being slightly lower over 5
if you've got a .ac router then make sure you also have a .ac adapter for the PC as it does make a massive difference